经典sql代码--解决并清除SQL被注入恶意代码的语句

注：sql注入，对任何一个网站来说，都应该遇到过吧，反正早些年我们网站是经常遇到。
今天收集这样一段代码，供大家参考，希望可以帮助到大家。

--解决并清除SQL被注入<script>恶意病毒代码的语句
declare @t varchar(255),@c varchar(255)  
declare table_cursor cursor for select a.name,b.name   
from sysobjects a,syscolumns b ,systypes c   
where a.id=b.id and a.xtype='u' and c.name   
in ('char', 'nchar', 'nvarchar', 'varchar','text','ntext')  
declare @str varchar(500),@str2 varchar(500)  
set @str='<script src=http://r01.3322.org/c.js></script>'/*要替换的内容 实际应用中去掉*/  
set @str2=''   
open table_cursor   
fetch next from table_cursor   
into @t,@c while(@@fetch_status=0)   
begin exec('update [' + @t + '] set [' + @c + ']=replace(cast([' + @c + '] as varchar(8000)),'''+@str+''','''+ @str2 +''')')  
fetch next from table_cursor  
into @t,@c end close table_cursor deallocate table_cursor; 

--sql 去掉字段html代码 dbo.StripAllTags(ProductDetails)
CREATE FUNCTION [dbo].[StripAllTags]
(
    @input VARCHAR(8000) --  NVARCHAR(MAX)--2000内改为VARCHAR(8000)
)
RETURNS NVARCHAR(MAX)
AS
BEGIN
    declare 
    @Result nvarchar(MAX),
    @start int,
    @end int,
    @len int

    set @input = @input+'<>'
    set @Result = ''
    set @len=len(@input)
    set @start = charindex('<',@input,1)
    set @end = charindex('>',@input,@start)
    while(@start<@end)
        begin        
            if(@start<>1) 
            set @Result = @Result + substring(@input,1,@start-1)
            set @len = @len - @end
            set @input = substring(@input,@end+1,@len)
            set @start = charindex('<',@input,1)
            set @end = charindex('>',@input,@start)
        end

    RETURN replace(@Result,'&nbsp;','')    

END

原文链接：http://www.cnblogs.com/zengxiangzhan/archive/2010/02/08/1665660.html